fix: allow reasoning traces when embeddings_only is True

[Pouyanpi]

Refactors the dialog rails validation logic to properly respect the embeddings_only flag, allowing reasoning traces to be enabled when this flag is set to True. Adds tests to verify this behavior.

related to #1161 and #1137

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 68.06%. Comparing base (d240625) to head (a5ae1ca).
⚠️ Report is 64 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1170   +/-   ##
========================================
  Coverage    68.05%   68.06%           
========================================
  Files          161      161           
  Lines        15820    15822    +2     
========================================
+ Hits         10767    10769    +2     
  Misses        5053     5053           

Flag	Coverage Δ
python	68.06% <100.00%> (+<0.01%)	⬆️

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Files with missing lines	Coverage Δ
nemoguardrails/rails/llm/config.py	89.83% <100.00%> (+0.03%)	⬆️

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[Copilot]

Pull Request Overview

This PR fixes the reasoning traces validation logic to allow reasoning traces when the embeddings_only flag is True and adds tests to verify this behavior.

• Updates validation in RailsConfig to bypass dialog rails checks when embeddings_only is enabled.
• Adds new tests for scenarios where embeddings_only is set for both user and bot message flows.

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
tests/test_config_validation.py	Updates tests and adds new test cases to verify embeddings_only behavior.
nemoguardrails/rails/llm/config.py	Refactors dialog rails validation logic to respect the embeddings_only flag.

Comments suppressed due to low confidence (2)

tests/test_config_validation.py:619

• [nitpick] The test function's docstring mentions bot messages, but the YAML configuration only specifies 'user_messages' with embeddings_only set. Clarify the test either by updating the YAML to include bot_messages or revising the docstring to match the configuration.

def test_reasoning_traces_with_bot_messages_embeddings_only():

nemoguardrails/rails/llm/config.py:1210

• [nitpick] The embeddings_only flag is only retrieved from the user_messages configuration. If there is an intention to support embeddings_only for bot messages as well, consider updating the logic accordingly or documenting the limitation.

embeddings_only = dialog_rails.get("user_messages", {}).get("embeddings_only", False)

[trebedea]

Looks good!

[Pouyanpi]

Looks good!

Thank you @trebedea !